Tool-holder for grinding-machines.



No. 736,573i PATENTE!) Anale, 1903'.`

, J.BATH.

TooL HOLDBR'POR GRINDING MACHINES.

APPLICATION FILED DEG. 8. 1902.

H0 MODEL. 2 SHEETS-SHEET 1.

57- 69 I 30 L 53 IG". E 75.. /II l 58 T- 75 l ll v l! i Wf, l 19 I" 8 73 fi? 76 L L (D Z0 G 1a E f, I I n No. 736,573. PATBNTBD AUG. 1a, 1903.

J. BATH. T001. HOLDER FOR GRINDING MACHINES.

APPLIUATIO'N FILED DBO. 8.1902.

No MQDBL. n z sums-SHEET 2.

, @Q l 10 "d o' rm v f A H gg a section on line 3 3 of Fig. 2.

NTTED STATES Patented August 18, 1903.

PATENT OEEICE.

TOOL-HOLDER FOR GRlNDlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 736,573, dated August 18, 1903. Application led December 8, 1902. Serial No. 134,278. (No model.)

T a/ZZ whom, t may concern:

Beit known that l, JOHN BATH, of lValtham, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Tool-Holders for Grinding-Machines, of which the following is a specication.

This invention relates to tool-holders for grinding-machines of the character disclosed in Letters Patent No. 665,303, granted to me January 1, 1901.

The objects of the present invention are to facilitate the sliding adjustment of the workholding jaw from one of its pivoted positions to another, to prevent cramping of the workholding jaw and its adj usting member in adj usting the jaw pivotally, to facilitate the positioning of tool-holding devices of a certain character, to position the edge of the adjustable jaw in fixed angular relation to the fixed work-holding abutment, to afford positive retraction to the jaw-adjusting pawls, and to provide a novel construction and relation of the xed work-holding parts with respect to the adjustable parts.

Of the accompanying drawings, Figure 1 represents a side elevation showing one embodiment of a tool-holder constructed in accordance with my invention. Fig. 2 represents avertical section thereof. Fig. 3 represents Fig. 4 represents a section on line 4 4 of Fig. 2. Fig. 5 represents a longitudinal section through the trough,showing a tool-holdin g device engaged by the pivotal jaw. Fig. 6 represents a side elevation, partly in section, showing a different embodiment of the invention. Fig. 7 represents a plan view of the latter.

The same reference characters indicate the same parts in all the figures.

Referring' at first to the embodiment shown in Figs. 1 to 5, inclusive, 10 is a block formed with a cylindrical stem 11, adapted to be held in the clamp of a suitable vise or holder and provided with iixed work-holding means consisting' of a V-shaped trough 12. On the block 10 is formed a horizontal stud 13, on which is pivotally mounted a jaw-supporting base 14, to which is pivoted the work-holding jaw 15, which cooperates with the trough 12. On the stud 13 the base 14 swings in a vertical plane parallel to the groove of the trough 12,

so as to bring the Workin g edge 16 of the jaw 15 into and out of parallelism with the bottom of the trough and hold either cylindrical or tapered Work, and on a hinge-pin 17 the jaw swings, so as to vary the distance of its lower edge from the bottom of the trough 12.

The pin 17 lits into either one of two hingepin holes 18 18, formed horizontally in the base 14, and is provided on one end with a head 19 and on the opposite end with a thread 20, screwing into one limb of the hub of jaw 15. Upon withdrawal of the pin 17 from one of the holes 18 for the purpose of inserting it in the other the jaw 15 would be capable of sliding to any indefinite position if not suitably guided; but for the purpose of guiding the jaw properly into alinement with either of the holes 18 l iix in one limb of the hub of the ljaw a bushing 21, Fig. 3, the inner end of which iits a parallel-sided groove 22, formed in the h older 1.4 and including one end of each of the holes 18. When the bushing 21 is in contact with either end of the groove 22, the hinge-pin holes in the hub of the jaw 15 are accurately positioned in alinement with either the one or the other of the holes 18. 23 is a stem having its inner end xed in the holder 14 and formed with a screw-thread 24 at its outer end, on which is mounted a nut 25, provided with a handle 26.` By a screw 27, engaged with a groove 28 on a block 29, mounted to slide vertically on the stem 23, the nut 25 during axial movement is maintained in engagement with said block, and by means of a feather or spline 41 on the block 29, working in a groove 42 on the stein 23, the block is held from rotating. The rotation of the nut therefore produces a positive axial movement of the block 29 in both directions, the principal advantage of the connection 27 28 being that it enables the block 29 and its connected pawls hereinafter described to be positively retracted, thereby increasing the ease and quickness with which the device can be manipulated. The block 29 and nut 25 constitute an adjuster for the jaw 15, and connection is made between the block and jaw by means of a pair of pawls 30 30, secured to a rock-shaft 31 on the block 29 and engaging teeth 32 32, formed on the back of the jaw 15. As the block 29 is screwed down the pawls 30 IOO rotate the jaws 15, so as to depress its lower end against the work, and during such adj ustment the pivotal movemeni of the pawls compensates for the different paths of movement of the jaw and block and avoids any cramping of the jaw or block.

As a means for holding the base 14 in any fixed angular position, and thus determining a fixed angular relation between the edge 16 of jaw 15 and the bottom of the trough 12, whereby the parts are properly related to act successively on a number of pieces of work having the same taper or inclination, or, in some instances, to gage the proper inclination for such work, I provide a set-screw 33, mounted in the base 14 and adapted to engage the `periphery of stud 13,therebyacting as a clamping device. 'Ihe position of parallelism between the jaw and trough being the most important one, I form-a conical recess 34 in the stud 13 for receiving the complemental conical end of screw 33 to hold the jaw and trough strictly parallel. ing device may be substituted for the above.

35 is a sleeve or tool-holder provided for holding the tapered shanks 36 of certain kinds of machine-tools, such as the cutter 37 shown in the drawings, said sleeve being mounted in the trough 12 and held therein by the jaw 15 while the teeth of the cutter are being ground. To accurately position this holder in an axial direction, and thus hold the cutter at an accurate adjustment with respect to a grinding-wheel or other instrument acting upon it, I form in the sleeve 35 a circumferential groove 38, the sides 3939 of which are similarly beveled. The corners 40 40 of the working edge 16 of jaw 15 are complementally beveled, so that they accurately iit the sides of the groove 38, the width of said groove being equal to the length of the working edge 16. As the jaw I5 is brought into connection with the sleeve 15 it will accordingly centralize or fix said sleeve at the adj ustment predetermined for it by the position of its groove.

In Figs. 6 and 7 Ihave represented the fixed work-holding means as embodying a head 10, mounted at the upper end of' stem 11 and provided with an abutment 43, located in a plane parallel to the stem 41, and a rest 44 at right angles to said abutment, the stud 13, on which base 14 is pivotedfextending downwardly from the lower side of said rest and parallel to the plane of abutment. The remainder of the device mounted on stud 13 is of the same construction as in Figs. 1 to 5. In this case, however, when employing a cutter-holding sleeve 45 I prefer to make two of its sides rectangular to conform to the parts 43 44, there being for-med in said sleeve a groove 46, having bevels to fit those of the jaw 16 and performing the same function as hereinbefore described. Other work, either 'tapered or straightsided, may be held between the jaw 15 and abutment 43, and when so held the whole of its upper face is free to Any other suitable clampbe operated on by tools. This arrangement makes of the device a compact and effective substitute for a work-holding vise. So long as the edge 16 of jaw 15 is to the right (as viewed in Fig. 6) of the vertical planethrough the pivot of said -jaw the pressure of the jaw 15 on the Work will tend to force the latter both laterally against abutment 43 and downwardly against rest 44, thereby firmly securing the work.

An additional advantage secured by posi- I tively retracting the pawls 30 by means of the parts 27 2S hereinbefore mentioned is, in this last-described arrangement, that the jaw 15 will recede by gravity when said pawls 30 are retracted, thus releasing the work without manipulation of the jaw. The advantage of employing the guiding means 21 22 hereinbefore described also increases in this arrangement, as the jaw 15v if unguided would be difficult to control in shifting the pin 17, owing to its tendency to drop out of proper alinement.

I claim- 1. In a tool-holder for grinding-machines, the combination of a work-.engaging pivotal jaw formed with teeth, a jaw-adjusting pawlsupport, and a pawl pivoted to said support and coacting with said teeth.

2. In a tool-holder f'or grinding-machines,

the combination of a jaw-supporting base IOO the combination of a jaw-supporting base v form ed with a plurality of hin ge-pin holes, and a guiding -groove connecting said holes, a work-engaging jaw slidingly mounted on said base and having a bushing guided in said groove, and a hinge-pin adapted to occupy either of said holes vand pivoting the jaw.

4. In a tool-holder for grinding-machines, the combination of work-holding means, and

a cooperating device formed with bevels for positioning the work. Y

5. In a tool-holder for grinding-machines, the combination of fixed work-holding means, a cooperating movable work-engaging jaw formed with bevels, and a tool-holder adapted to be held between said ixed means and jaw and formed with complemental bevels.

6. In a tool-holder for grinding-machines, the combination of a head provided with workholding means and a pivot-stud, a jaw-supporting base pivoted to said stud, a work-engaging jaw pivoted to said base and located in different angular relations with said workholding means by movement of said base on said stud, and a clamping device adapted to hold the base in a variety of angular Positions on said stud.

7. In a tool-holder for grinding-machines,

IIC

the combination of a pivotal Workengaging pivoted to said head on an axis parallel to the jaw, a screw-threaded stern, a j atv-adjusting plane of said abutment, and a Work-engaging block mounted to slide axially but not rotate jaw pivoted to said hase and cooperating with on said stein, a nut mounted on said stem, said rest and abutment to hold the Work. x 5 5 and means for permitting relative rotary and I In testimony whereof I have affixed my sigpreventng relative axial movements of said I nature in presence of tWo Witnesses. nut and block. 1

8. In a tool-holder for grnding-lnaehines, I JOHN BA'HI' Vitnesses: v

R. M. PIERsoN, l ADELINE C. RATIGAN.

the combination of a head having` a Work- :o holding` abutment, a work-rest extending at right angles thereto, a jaw-supporting base 

